Date: Tue, 24 Sep 2019 11:45:37 -0400 From: John Fleming <john@spikefishsolutions.com> To: freebsd-stable@freebsd.org Subject: Question about bottle neck in storage Message-ID: <CABy3cGxjhTcg%2Bpg2FiCc4OqG4Z1Qy1vFdvo7zU_t0ahC3mb%2BYw@mail.gmail.com>
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Is there anyway to see how busy a SAS/Sata controller is vs disks? I have a R720 with 14 Samsung 860 EVOs in it (its a lab server) in raid 10 ZFS. When firing off a dd I (bs=1G count=10) seems like the disks never go above %50 busy. I'm trying to figure out if i'm maxing out SATA 3 BW or if its something else (like terrible dd options). my setup is Dell R720 with 2 x LSI 9361 cards. Each card is going to a dedicated 8 drive board inside the front of the R720. Basically i'm just saying its not a single SAS cable to 14 drives. Don't have cpu info hand.. zeon something. DDR3-1600 (128GB) Both controllers are in 8x slots running PCIe gen 3. BTW i'm sure this has been asked a million times but what would be some decent benchmark tests while i'm at it?
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